JP2959005B2 - Portable device with depth gauge - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a portable device with a depth gauge.

[Conventional technology]

As described in Japanese Patent Application Laid-Open No. Sho 62-21030, a conventional portable device with a depth gauge is known in which a pressure sensor unit is fixed to a concave step portion of a case by compressing a resin ring and a waterproof function is secured. Have been.

[Problems to be solved by the invention]

However, in the above-described related art, the pressure sensor unit is mounted on the upper surface of the case in order to fix the pressure sensor unit to the concave step portion of the case by compressing the resin ring. In this case, since the pressure sensor unit is supported by the step portion of the case, it is strong against external pressure such as water pressure and does not deviate, but, for example, in a helium environment when performing saturated diving. If the helium gas is used for a long time, helium gas enters the inside of the resin ring and the internal pressure increases.

When the pressure is reduced in this state, the pressure sensor unit
Contrary to the water pressure, since it receives a force pushed from the inside, the above-mentioned conventional technology is completely defenseless, and the pressure sensor unit comes off. In this,
Functionally problematic, like using helium gas,
In saturated diving, you cannot even carry.

Therefore, the present invention is to solve such disadvantages, and the purpose thereof is to sufficiently fulfill its purpose even in a helium gas environment used for saturated diving, and to be a device that can be freely carried. Is to provide.

[Means for solving the problem]

The portable device with a water depth gauge of the present invention includes a case and a semiconductor pressure sensor unit for measuring water depth, and the semiconductor sensor unit is mounted inside the case, and the case is attached to the case from outside the case. In a portable device with a water depth gauge having a pressure introduction hole for introducing pressure to a semiconductor sensor unit, a packing is arranged between the semiconductor sensor unit and the case, and the semiconductor sensor unit is located between the pressure introduction hole and the semiconductor sensor unit. Largely, the semiconductor sensor unit is mounted from the inside with respect to the pressure introducing hole, and the semiconductor sensor unit is mounted and supported from the inside with respect to the pressure introducing hole such that an upper surface thereof has a gap with the case. It is characterized by being performed.

〔Example〕

FIG. 1 is a cross-sectional view of a portable device with a depth gauge, showing one embodiment of the present invention.

In the present invention, the sensor guide 2 is fixed to the inside of the pressure introducing hole 10 of the case 1 by welding or the like, and the packing 3 is held on the inner peripheral portion of the sensor guide 2. In this state, the sensor unit 4 is mounted from the inside of the case 1, and compresses the packing 3 to ensure waterproofness. However, in this state, the sensor unit 4
Since it is easily displaced by external pressure, the sensor fixing plate 5 attached to the case 1 via the screw 6
It is supported from the inside of the case 1.

The sensor unit 4 is electrically connected to the circuit board 8 by the conductive spring 7 and sends various kinds of pressure information to the main body.

When the portable device with a depth gauge of the present invention is used in a helium gas environment at the time of saturation diving, helium gas enters the inside of the case through a packing portion by using for a long time,
It is possible that the internal pressure increases.

When pressure reduction is started in this state, when the internal pressure becomes higher than the external pressure, a force is applied to the pressure sensor unit 4 in a direction in which the pressure is pressed from the inside, which is the opposite direction as before.

At this time, in the present invention, a part or the whole of the pressure sensor unit 4 is larger than the pressure introducing hole 10, so that the part hits the case 1 or the sensor guide 2, and the pressure sensor unit 4 does not move outward. In FIG. 1, the upper surface of the pressure sensor unit 4 hits the case 1 to prevent the pressure sensor unit 4 from coming off.

Further, in FIG. 1 of the present invention, the pressure sensor unit 4 is entirely larger than the pressure introducing hole. However, even if only the upper surface or the lower surface is larger than the pressure introducing hole, the effect is the same. If the portion is formed in a rectangular shape instead of a circular shape, it also serves as a stop for rotation, so that positioning with the circuit board becomes easy.

〔The invention's effect〕

As described above, in the present invention, part or all of the pressure sensor unit is larger than the pressure introduction hole of the case,
When used in a helium gas environment of a saturated dive, when a force that pushes the pressure sensor unit outward due to the internal pressure acts, the pressure sensor unit moves outward only in the gap with the case, but beyond that, Since the upper surface of the pressure sensor unit contacts the case, the pressure sensor unit does not move and can be used without any problem.

In addition, this gap is preferably smaller in order to reduce clogging of salt and dust, but when the tip protection agent such as RTV is filled up to the upper surface of the pressure sensor unit as in the embodiment, You need to pay attention to the dimensions.

In addition, since the pressure sensor unit is electrically connected to the circuit board by the conduction spring, the conduction failure does not occur with a movement amount of the clearance.

This is the same when a conductive connector or a flexible substrate is used.

As described above, in the present invention, by making a part or the whole of the pressure sensor unit larger than the pressure introduction hole of the case, even when used in a helium gas environment of saturated diving, the sensor unit does not come off. , A device that can be freely carried.

Also, for this reason, a portable device with a water depth gauge excellent in waterproof performance, environmental resistance, and the like can be realized, although the cost is not particularly high and the structure is stable and simple.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a portable device with a depth gauge, showing one embodiment of the present invention. FIG. 2 is a cross-sectional view of a conventional portable device with a depth gauge. 1, 21 ... Case 2 ... Sensor guide 3 ... 0 ring packing 4, 24 ... Sensor unit 5 ... Sensor fixing plate 7 ... Screw 7, 27 ... Conducting spring 8, 28 ... Circuit board 9 ... … Dustproof sheet 30… Resin packing 10, 31 …… Pressure introduction hole

Claims (1)

(57) [Claims] A semiconductor pressure sensor unit for measuring water depth, wherein said semiconductor sensor unit is mounted inside said case, and said semiconductor sensor unit is connected to said semiconductor sensor unit from outside said case. In a portable device with a depth gauge having a pressure introduction hole for introducing pressure, a packing is disposed between the semiconductor sensor unit and the case, wherein the semiconductor sensor unit is larger than the pressure introduction hole, A unit is attached to the pressure introduction hole from the inside, and the semiconductor sensor unit is attached and supported from the inside to the pressure introduction hole such that an upper surface thereof has a gap with the case. Mobile device with a depth gauge.